feat: smart git URL parsing for browser URLs

- Add git URL parsing utilities (extract_base_repo_url, parse_git_url)
- Support GitHub, GitLab, Bitbucket browser URL detection
- Add /projects/repositories/parse-url endpoint
- Enhance repository creation to detect browser URLs and suggest corrections
- Add real-time URL validation in frontend with debouncing
- Show visual indicators (green/yellow/red) for URL validity
- Display inline suggestions with 'Use Suggested' button
- Add comprehensive unit tests for URL parsing
- Quality gates: ruff ✓, mypy ✓, typecheck ✓, lint ✓, build ✓

openspec/changes/smart-git-url-parsing/.openspec.yaml

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+schema: spec-driven
+created: 2026-05-19

openspec/changes/smart-git-url-parsing/design.md

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+# Smart Git URL Parsing - Design
+
+## Architecture
+
+```
+User pastes URL → Frontend validates → Backend validates → Clone repo
+                    ↓                      ↓
+            Show suggestions         Parse & suggest
+```
+
+## URL Detection Logic
+
+### Patterns to Detect
+
+1. **GitHub/GitLab/Bitbucket browser URLs**
+   - `https://github.com/owner/repo/tree/branch-name`
+   - `https://github.com/owner/repo/blob/branch/path/to/file`
+   - `https://github.com/owner/repo/pull/123`
+   - `https://gitlab.com/owner/repo/-/tree/branch`
+   - `https://bitbucket.org/owner/repo/src/branch/`
+
+2. **URLs with query parameters**
+   - `https://github.com/owner/repo?tab=readme-ov-file`
+   - `https://github.com/owner/repo.git?branch=develop`
+
+3. **Valid clone URLs (should pass through)**
+   - `https://github.com/owner/repo.git`
+   - `git@github.com:owner/repo.git`
+   - `https://github.com/owner/repo` (without .git)
+
+### URL Parsing Rules
+
+```python
+def extract_base_repo_url(url: str) -> str | None:
+    """Extract base repository URL from a browser/git URL.
+    
+    Examples:
+        https://github.com/user/repo/tree/main → https://github.com/user/repo.git
+        https://github.com/user/repo.git → https://github.com/user/repo.git
+        git@github.com:user/repo.git → git@github.com:user/repo.git
+        https://gitlab.com/user/repo/-/blob/main/README.md → https://gitlab.com/user/repo.git
+    
+    Returns None if URL doesn't match known patterns.
+    """
+    ...
+```
+
+**Algorithm:**
+1. Remove query parameters
+2. Detect host (github.com, gitlab.com, bitbucket.org, etc.)
+3. For GitHub: Remove `/tree/*`, `/blob/*`, `/pull/*`, `/issues/*` paths
+4. For GitLab: Remove `/-/tree/*`, `/-/blob/*` paths  
+5. For Bitbucket: Remove `/src/*` paths
+6. Ensure `.git` suffix
+7. Return cleaned URL or None
+
+## API Changes
+
+### POST /repositories (enhanced)
+
+**Request Body:**
+```json
+{
+  "project_id": "uuid",
+  "name": "my-repo",
+  "remote_url": "https://github.com/user/repo/tree/main",
+  "is_mirror": false
+}
+```
+
+**New Response for Non-Repo URLs (422):**
+```json
+{
+  "detail": "URL appears to be a browser URL, not a git clone URL",
+  "suggested_url": "https://github.com/user/repo.git",
+  "original_url": "https://github.com/user/repo/tree/main",
+  "needs_confirmation": true
+}
+```
+
+### New Endpoint: POST /repositories/parse-url
+
+**Request:**
+```json
+{
+  "url": "https://github.com/user/repo/tree/main"
+}
+```
+
+**Response:**
+```json
+{
+  "original_url": "https://github.com/user/repo/tree/main",
+  "base_url": "https://github.com/user/repo.git",
+  "is_valid_repo_url": false,
+  "needs_parsing": true,
+  "message": "This looks like a browser URL. Did you mean to clone https://github.com/user/repo.git?"
+}
+```
+
+## Frontend Flow
+
+### Repository Creation Dialog (Enhanced)
+
+1. **User pastes URL**
+2. **Frontend calls `/repositories/parse-url`** (debounced)
+3. **If URL needs parsing:**
+   - Show yellow warning indicator
+   - Display: "This looks like a browser URL"
+   - Show suggested URL with "Use this instead" button
+   - Allow user to proceed with original URL anyway
+4. **If URL is valid:**
+   - Show green checkmark
+   - Proceed normally
+5. **User clicks "Create"**
+6. **If backend returns 422 with suggestion:**
+   - Show confirmation dialog with suggested URL
+   - Options: "Use suggested URL", "Use original", "Cancel"
+
+### UI Components
+
+**URLInput Component:**
+- Input field with validation status icon
+- Shows inline suggestions when URL is detected as browser URL
+- Green/yellow/red border based on validation
+
+**URLCorrectionDialog Component:**
+- Modal dialog for confirming URL correction
+- Shows before/after comparison
+- Clear action buttons
+
+## Implementation Order
+
+1. **Backend utilities** - URL parsing functions with tests
+2. **Backend endpoint** - `/repositories/parse-url`  
+3. **Backend validation** - Enhanced POST /repositories with suggestion response
+4. **Frontend URL input** - Enhanced input with validation feedback
+5. **Frontend dialog** - Confirmation dialog for URL corrections
+6. **Integration** - Wire up parse-url endpoint to frontend
+7. **Tests** - Unit tests for URL parsing, integration tests for flow
+
+## Error Handling
+
+### Invalid URLs
+- Completely malformed URLs: Return 400 with clear message
+- Unsupported hosts: Return 400 with "Unsupported git host" 
+- Private repos (auth needed): Return 401/403 with auth instructions
+- Non-existent repos: Return 404 (from git clone failure)
+
+### Clone Failures
+- Network issues: Retry with exponential backoff
+- Auth required: Prompt for credentials
+- Large repos: Show progress indicator
+- Timeout: Increase timeout for large repos

openspec/changes/smart-git-url-parsing/proposal.md

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+# Smart Git URL Parsing for Repository Creation
+
+## Problem
+
+When users add a new repository, they often paste a full browser URL that includes branch names, file paths, or query parameters instead of a clean repository URL. This causes the clone operation to fail with unclear error messages.
+
+**Examples of problematic URLs:**
+- `https://github.com/user/repo/tree/main` (includes branch path)
+- `https://github.com/user/repo/blob/main/README.md` (includes file path)
+- `https://github.com/user/repo?tab=readme-ov-file` (includes query params)
+- `https://github.com/user/repo/pull/123` (includes PR path)
+
+**Current behavior:** The backend attempts to clone the exact URL, which fails with "fatal: repository not found" or similar errors.
+
+**User confusion:** Users don't understand why the clone failed since the URL works in their browser.
+
+## Solution
+
+Implement smart URL parsing that:
+
+1. **Detects non-repo URLs**: Recognizes when a URL contains paths like `/tree/`, `/blob/`, `/pull/`, or query parameters
+2. **Extracts base repo URL**: Strips away branch names, file paths, query parameters to get `https://host/owner/repo.git`
+3. **Suggests correction**: Shows the user the extracted base URL and asks for confirmation
+4. **Improves clone handling**: Handles edge cases and provides clear error messages
+
+## Benefits
+
+- **Better UX**: Users get helpful suggestions instead of cryptic errors
+- **Fewer support issues**: Self-service correction reduces confusion
+- **More robust**: Handles common copy-paste mistakes automatically
+- **Educational**: Teaches users what a proper git URL looks like
+
+## Scope
+
+### Backend
+- URL parsing utilities to detect and extract base repo URLs
+- Enhanced validation in repository creation endpoint
+- Clear error messages for unsupported URLs
+
+### Frontend
+- UI dialog to show URL correction suggestions
+- Option to accept or edit the suggested URL
+- Visual indicator for URL validation status

openspec/changes/smart-git-url-parsing/specs/spec.md

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+# Smart Git URL Parsing Specification
+
+## Requirements
+
+### Functional Requirements
+
+1. **URL Detection**: Detect when a provided URL is a browser URL rather than a git clone URL
+2. **URL Extraction**: Extract the base repository URL from browser URLs
+3. **User Confirmation**: Show extracted URL to user and ask for confirmation
+4. **Flexible Input**: Allow users to proceed with original URL if they prefer
+5. **Multiple Hosts**: Support GitHub, GitLab, Bitbucket, and generic git hosts
+
+### Non-Functional Requirements
+
+1. **Performance**: URL parsing should be instant (< 100ms)
+2. **Accuracy**: Should correctly identify 95%+ of browser URLs
+3. **User Experience**: Clear, helpful messages without technical jargon
+4. **Backward Compatibility**: Existing valid git URLs should continue to work
+
+## API Specification
+
+### POST /git-repositories/parse-url
+Parse a URL and determine if it's a valid clone URL or needs correction.
+
+**Request Body:**
+```json
+{
+  "url": "https://github.com/user/repo/tree/main"
+}
+```
+
+**Response 200:**
+```json
+{
+  "original_url": "https://github.com/user/repo/tree/main",
+  "base_url": "https://github.com/user/repo.git",
+  "is_valid_clone_url": false,
+  "needs_parsing": true,
+  "host": "github.com",
+  "message": "This URL contains a branch path. The repository URL is: https://github.com/user/repo.git"
+}
+```
+
+**Response 200 (already valid):**
+```json
+{
+  "original_url": "https://github.com/user/repo.git",
+  "base_url": "https://github.com/user/repo.git",
+  "is_valid_clone_url": true,
+  "needs_parsing": false,
+  "host": "github.com",
+  "message": "Valid git repository URL"
+}
+```
+
+### Enhanced POST /projects/{project_id}/repositories
+Enhanced to return suggestions when URL needs parsing.
+
+**New 422 Response:**
+```json
+{
+  "detail": "The provided URL appears to be a browser URL, not a git clone URL",
+  "suggested_url": "https://github.com/user/repo.git",
+  "original_url": "https://github.com/user/repo/tree/main",
+  "error_code": "URL_NEEDS_PARSING"
+}
+```
+
+**Request Body (with force flag):**
+```json
+{
+  "name": "my-repo",
+  "remote_url": "https://github.com/user/repo/tree/main",
+  "is_mirror": false,
+  "force_original_url": true
+}
+```
+
+## Data Model
+
+### URLParseResult
+```python
+class URLParseResult:
+    original_url: str
+    base_url: str | None
+    is_valid_clone_url: bool
+    needs_parsing: bool
+    host: str | None
+    message: str
+    error_code: str | None
+```
+
+## URL Parsing Rules
+
+### Supported Hosts
+- github.com
+- gitlab.com  
+- bitbucket.org
+- Any custom domain with git hosting
+
+### GitHub URL Patterns
+```
+https://github.com/{owner}/{repo} → valid
+https://github.com/{owner}/{repo}.git → valid
+https://github.com/{owner}/{repo}/tree/{branch} → extract base
+https://github.com/{owner}/{repo}/blob/{branch}/{path} → extract base
+https://github.com/{owner}/{repo}/pull/{number} → extract base
+https://github.com/{owner}/{repo}/issues/{number} → extract base
+https://github.com/{owner}/{repo}/actions → extract base
+```
+
+### GitLab URL Patterns
+```
+https://gitlab.com/{owner}/{repo} → valid
+https://gitlab.com/{owner}/{repo}.git → valid
+https://gitlab.com/{owner}/{repo}/-/tree/{branch} → extract base
+https://gitlab.com/{owner}/{repo}/-/blob/{branch}/{path} → extract base
+https://gitlab.com/{owner}/{repo}/-/merge_requests/{number} → extract base
+```
+
+### Bitbucket URL Patterns
+```
+https://bitbucket.org/{owner}/{repo} → valid
+https://bitbucket.org/{owner}/{repo}.git → valid
+https://bitbucket.org/{owner}/{repo}/src/{branch} → extract base
+```
+
+### Extraction Algorithm
+1. Parse URL components (scheme, netloc, path, query)
+2. Remove query parameters entirely
+3. Split path by `/`
+4. Remove trailing segments that indicate non-repo paths:
+   - `tree/*`, `blob/*`, `pull/*`, `issues/*`, `actions`
+   - `-/tree/*`, `-/blob/*`, `-/merge_requests/*`
+   - `src/*`
+5. Reconstruct URL with remaining path
+6. Add `.git` suffix if missing (for HTTPS URLs)
+7. Return extracted URL
+
+## Frontend Specification
+
+### URL Input Component
+- Input field for repository URL
+- Real-time validation (debounced 300ms)
+- Visual indicators:
+  - 🟢 Green border: Valid git URL
+  - 🟡 Yellow border: Browser URL detected, suggestion shown
+  - 🔴 Red border: Invalid/malformed URL
+- Inline suggestion banner below input:
+  ```
+  ⚠️ This looks like a browser URL
+  Suggested: https://github.com/user/repo.git
+  [Use Suggested] [Keep Original]
+  ```
+
+### Confirmation Dialog
+Shown when backend returns 422 with suggestion:
+```
+┌─────────────────────────────────────┐
+│ URL Correction Suggestion            │
+├─────────────────────────────────────┤
+│                                      │
+│ The URL you entered appears to be   │
+│ a browser URL, not a git clone URL. │
+│                                      │
+│ Original:                            │
+│ https://github.com/user/repo/tree/main│
+│                                      │
+│ Suggested repository URL:            │
+│ https://github.com/user/repo.git     │
+│                                      │
+│ [Use Suggested URL]  [Use Original] │
+│ [Cancel]                            │
+└─────────────────────────────────────┘
+```
+
+## Error Codes
+
+| Error Code | Description | User Message |
+|------------|-------------|--------------|
+| URL_NEEDS_PARSING | Browser URL detected | "This looks like a browser URL. Did you mean: {suggested_url}?" |
+| INVALID_URL | Malformed URL | "Please enter a valid URL" |
+| UNSUPPORTED_HOST | Unknown git host | "This git host is not supported" |
+| CLONE_FAILED | Git clone failed | "Failed to clone repository: {error}" |
+| AUTH_REQUIRED | Private repo, need auth | "This repository requires authentication" |
+
+## Testing Strategy
+
+### Unit Tests (URL Parsing)
+- Test all GitHub URL patterns
+- Test all GitLab URL patterns  
+- Test all Bitbucket URL patterns
+- Test valid URLs pass through unchanged
+- Test edge cases (subgroups, nested paths, etc.)
+
+### Integration Tests
+- Test parse-url endpoint with various URLs
+- Test repository creation with browser URL (should suggest correction)
+- Test repository creation with force flag
+- Test clone operation with corrected URL
+
+### Frontend Tests
+- Test URL input validation states
+- Test suggestion banner display
+- Test confirmation dialog flow
+- Test acceptance/rejection of suggestions

openspec/changes/smart-git-url-parsing/tasks.md

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+# Smart Git URL Parsing - Tasks
+
+## Phase 1: Backend URL Parsing
+
+- [ ] **Task 1.1**: Create URL parsing utilities
+  - Create `src/utils/git_url_parser.py`
+  - Implement `extract_base_repo_url()` function
+  - Support GitHub, GitLab, Bitbucket patterns
+  - Handle query parameters, branch paths, file paths
+  - Add comprehensive unit tests
+
+- [ ] **Task 1.2**: Create URL validation endpoint
+  - Add `POST /git-repositories/parse-url` endpoint
+  - Returns URLParseResult with original, base, validation status
+  - Add tests for endpoint
+
+- [ ] **Task 1.3**: Enhance repository creation endpoint
+  - Update `POST /projects/{project_id}/repositories`
+  - Detect browser URLs and return 422 with suggestion
+  - Add `force_original_url` flag to bypass suggestion
+  - Update response models
+
+## Phase 2: Frontend Implementation
+
+- [ ] **Task 2.1**: Create API client for URL parsing
+  - Add `parseGitUrl()` function to `api/git_repositories.ts`
+  - Add types for URLParseResult
+
+- [ ] **Task 2.2**: Enhance repository creation form
+  - Add real-time URL validation to input field
+  - Show visual indicators (green/yellow/red)
+  - Display inline suggestion banner
+  - Add "Use Suggested" / "Keep Original" buttons
+
+- [ ] **Task 2.3**: Create confirmation dialog
+  - Create `URLCorrectionDialog` component
+  - Shows original vs suggested URL comparison
+  - Handles accept/reject/cancel actions
+  - Integrate with repository creation flow
+
+## Phase 3: Integration & Testing
+
+- [ ] **Task 3.1**: Wire up frontend to backend
+  - Call parse-url endpoint on URL input change (debounced)
+  - Handle 422 responses from repository creation
+  - Show confirmation dialog when needed
+
+- [ ] **Task 3.2**: Add error handling
+  - Handle network errors during URL validation
+  - Show clear error messages for unsupported URLs
+  - Handle clone failures gracefully
+
+- [ ] **Task 3.3**: Run quality gates
+  - Backend: ruff, mypy, pytest
+  - Frontend: typecheck, lint, build
+
+- [ ] **Task 3.4**: Manual testing
+  - Test with GitHub URLs (tree, blob, pull)
+  - Test with GitLab URLs (-/tree, -/blob)
+  - Test with valid git URLs (should pass through)
+  - Test force_original_url flag